1581312045 has 16 divisors (see below), whose sum is σ = 2539109952. Its totient is φ = 840362880.

The previous prime is 1581312043. The next prime is 1581312049. The reversal of 1581312045 is 5402131851.

It is not a de Polignac number, because 1581312045 - 2¹ = 1581312043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581312043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183367 + ... + 191796.

It is an arithmetic number, because the mean of its divisors is an integer number (158694372).

Almost surely, 2^1581312045 is an apocalyptic number.

1581312045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1581312045 is a deficient number, since it is larger than the sum of its proper divisors (957797907).

1581312045 is a wasteful number, since it uses less digits than its factorization.

1581312045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375452.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 1581312045 is about 39765.7144409603. The cubic root of 1581312045 is about 1165.0355911444.

Adding to 1581312045 its reverse (5402131851), we get a palindrome (6983443896).

The spelling of 1581312045 in words is "one billion, five hundred eighty-one million, three hundred twelve thousand, forty-five".